<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        a{
            text-decoration: none;
            display: block;
            width: 120px;
            height: 35px;
            text-align: center;
            line-height: 35px;
            border: 1px solid #ccc;
            background: purple;
            color: #fff;
        }
    </style>
</head>
<body>
<a href="练习1.html">作业1</a>
<a href="练习2.html">作业2</a>
<a href="练习3.html">作业3</a>
</body>
</html>